Make bootable USB or DVD of Mac OS X Mountain Lion

Read the steps to make a bootable DVD or USB for Mac OS X Mountain Lion installation.

Once you have purchased your copy of Mountain Lion X you might want to make a physical copy of it on CD or in USB drive. Here are the steps to burn the Mountain Lion X on your USB or DVD.

Though after purchasing your copy of Mountain Lion X from the app store you can install the OS n number of times afterwards, but if you would prefer to keep an offline backup of it then here are the steps to make a bootable copy of Mountain Lion X on your USB or DVD. Having a hard copy of the installer will be useful in case you have to do a clean install of the system of want to install Mountain Lion X on a hacked Machintosh.

Like the previous Mountain Lion's update, this time too, the installer disappears from the applications folder as soon as the update is finished. There are two ways to keep the Mountain Lion set up for installation:
1. First is to re-download the file by pressing down the option key while clicking on the purchase tab or to get the installer back by using the Time Machine backup.
2. Second but better option is to burn the installer before proceeding for the Mountain Lion X update.

Requirements to burn Mountain Lion X: To make a back up of the installer on a physical media you need a DVD or flash drive of 5GB or larger.

Steps to make a back up of the Moutain Lion X installer

  1. Download the Mountain Lion X installer from the app store. The set up would appear in your Applications folder.

  2. Right click the installer > Show Package Contents > Contents > SharedSupport > locate the file InstallESD.dmg

  3. Launch Disk Utility and copy the DMG file in the side bar at the left side. To burn the file in DVD, insert a blank DVD, select the disk image option in the sidebar and click on the "Burn" button. Now you can use the DVD when you reboot into OS X by holding the options key down.

  4. For burning the installation in a USB, first you need to completely format the USB drive:

    1. Now connect the USB to your MAC and select in from the side bar in Disk Utility. Here, open the Partition tab, select "1 Partition" from the drop down list and select the format Mac OS Extended (Journaled)

    2. Select "GUID Partition Table" from the Options menu. This will finally set the USB to be bootable for Mac and can now be correctly formatted. Hit Apply to format the complete drive.

    3. Open the Restore tab now, select the DMG file as source and the flash drive as destination. At last now hit the apply button.

  5. For both DVD and USB, restart your Mac, hold the Options key down to start he booting for installation of Mountain Lion X in your Mac.

  6. The tools mentioned in the steps- Disk Utility and Time Machine Recovery are utility apps and you need to have it installed on your Mac to follow these steps. Though you will always have the recovery partition on your drive to revert back in case something goes wrong in installation, it is better to have a clean installation back up media handy.

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